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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a8f701e16f4acdca5c881654c71f3eb8ec79a1bced3f139df177cf2ce6d4b1b' 
  AND token = '2etw82iv0VMkWEIyTTx7ynihnI5q49RmWSbZqE7Psd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}